An enhancement in structural and superconducting properties of Bi2212 epitaxial thin films grown by the Pechini sol–gel method

2013 ◽  
Vol 46 (2) ◽  
pp. 379-386 ◽  
Author(s):  
Xiaoming Lu ◽  
Tianlin Wang ◽  
Yaming Zhang ◽  
M. Babar Shahzad ◽  
Yang Qi
Keyword(s):  
Thin Films ◽  
Transition Temperature ◽  
Sol Gel ◽  
Superconducting Thin Films ◽  
Epitaxial Thin Films ◽  
Superconducting Properties ◽  
Gel Method ◽  
Sol Gel Method ◽  
Sintering Time ◽  
Coating Method

Bi2Sr2CaCu2O8+δ(Bi2212) superconducting thin films were prepared by the Pechini sol–gel method using nitrates as reactants. The precursor sol was deposited on SrTiO3(001) single-crystal substratesviathe spin-coating method, and the results revealed the lowering of the Bi2212 phase-transition temperature; meanwhile the sintering time was significantly reduced. According to this investigation, the phase purity and crystallinity of Bi2212 thin films were obviously improved owing to the stable gel mechanism; theTc,onsettransition temperature value of the purec-axis Bi2212 thin films rose to about 95 K.

Structure of Hydrogen Gas Sensing TiO2 Thin Films Prepared by Sol-Gel Method and their Comparison with Magnetron Sputtered Films

2013 ◽  
Vol 543 ◽  
pp. 293-296 ◽  
Author(s):  
G. Plesch ◽  
A.A. Haidry ◽  
M. Gregor ◽  
P. Durina ◽  
J. Gregus ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetron Sputtering ◽  
Gas Sensing ◽  
Sol Gel ◽  
Rutile Phase ◽  
Hydrogen Gas ◽  
Gel Method ◽  
Sensing Properties ◽  
Sol Gel Method ◽  
Coating Method

TiO2thin films with a thickness of about 150 nm were deposited by spin coating method on sapphire substrate from a sol-gel system. The hydrogen sensing properties of TiO2films annealed at various temperatures were studied and correlated with their structure, optical and electrical properties. The annealing temperatures in the range of 600 800 °C lead to anatase films with a roughness in the range of 0.6 0.9 nm. Their sensitivity towards hydrogen is low. The thin films annealed at temperatures in the range 900 1000 °C consist of rutile phase and their roughness increased to 11.7 13.5 nm. They showed good hydrogen sensitivity with optimal operating temperature 200 250 °C. The structure and sensing properties of the prepared films are compared with those synthesized with magnetron sputtering. The maximum of sensitivity was measured on the thin films with diameter of the grains about 100 nm in both cases, i.e. on thin films prepared by sol-gel method as well as on thin films prepared by magnetron sputtering. The maximum sensitivity correlates with the diameter of the grains and dont depend on the allotropy of the titanium dioxide anatase or rutile.

scholarly journals The structural studies of aluminosilicate gels and thin films synthesized by the sol-gel method using different Al2O3 and SiO2 precursors

2015 ◽  
Vol 33 (4) ◽  
pp. 732-741 ◽  
Author(s):  
Anna Adamczyk
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Porous Ceramics ◽  
Dip Coating ◽  
Treatment Temperature ◽  
Gel Method ◽  
Sol Gel Method ◽  
Coating Method ◽  
Different Temperatures ◽  
Ft Ir

AbstractAluminosilicate materials were obtained by sol-gel method, using different Al2O3 and SiO2 precursors in order to prepare sols based on water and organic solvents. As SiO2 precursors, Aerosil 200TM and tetraethoxysilane TEOS: Si(OC2H5)4 were applied, while DisperalTM and aluminium secondary butoxide ATSB: Al(OC4H9)3 were used for Al2O3 ones. Bulk samples were obtained by heating gels at 500 °C, 850 °C and at 1150 °C in air, while thin films were synthesized on carbon, steel and alundum (representing porous ceramics) substrates by the dip coating method. Thin films were annealed in air (steel and alundum) and in argon (carbon) at different temperatures, depending on the substrate type. The samples were synthesized as gels and coatings of the composition corresponding the that of 3Al2O3·2SiO2 mullite because of the specific valuable properties of this material. The structure of the annealed bulk samples and coatings was studied by FT-IR spectroscopy and XRD method (in standard and GID configurations). Additionally, the electron microscopy (SEM) together with EDS microanalysis were applied to describe the morphology and the chemical composition of thin films. The analysis of FT-IR spectra and X-ray diffraction patterns of bulk samples revealed the presence of γ-Al2O3 and δ-Al2O3 phases, together with the small amount of SiO2 in the particulate samples. This observation was confirmed by the bands due to vibrations of Al–O bonds occurring in γ-Al2O3 and δ-Al2O3 structures, in the range of 400 to 900 cm−1. The same phases (γ-Al2O3 and δ-Al2O) were observed in the deposited coatings, but the presence of particulate ones strongly depended on the type of Al2O3 and SiO2 precursor and on the heat treatment temperature. All thin films contained considerable amounts of amorphous phase.

Synthesis of LiCoO2 epitaxial thin films using a sol–gel method

2015 ◽  
Vol 274 ◽  
pp. 417-423 ◽  
Author(s):  
Taeri Kwon ◽  
Tsuyoshi Ohnishi ◽  
Kazutaka Mitsuishi ◽  
Tadashi C. Ozawa ◽  
Kazunori Takada
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Epitaxial Thin Films ◽  
Gel Method ◽  
Sol Gel Method

Crystalline characteristics and superconducting properties of Bi2212 thin films prepared by the Pechini sol–gel method: the effect of different substrates on the film growth

2015 ◽  
Vol 48 (1) ◽  
pp. 37-43 ◽  
Author(s):  
Xiaoming Lu ◽  
Xuejiao Miao ◽  
Dalu Sun ◽  
M. Babar Shahzad ◽  
Yang Qi
Keyword(s):  
Thin Films ◽  
Phase Formation ◽  
Temperature Region ◽  
Film Growth ◽  
Sol Gel ◽  
Formation Temperature ◽  
Gel Method ◽  
Sol Gel Method ◽  
Coating Method ◽  
Higher Temperature

Bi2Sr2CaCu2O8+δ(Bi2212) superconducting thin films were prepared by the Pechini sol–gel method using nitrates as reactants. The precursor sol was deposited on LaAlO3(100) and MgO(100) single-crystal substratesviathe spin-coating method. The results revealed that the phase formation temperature region of the pure Bi2212 phase and perfectly epitaxial Bi2212 films deposited on LaAlO3substrates was significantly expanded to 8 K, indicating an improvement in crystallization of Bi2212 films. In addition, the phase formation temperature region of the pure phase andc-axis-grown Bi2212 films deposited on MgO substrates was reduced to 5 K because of the deterioration of epitaxy of Bi2212 films sintered at higher temperature. According to the investigation, theTc,onsetvalues of Bi2212 films grown on MgO substrates were about 92 K. Meanwhile, the optimalTc,onsetvalue of Bi2212 superconducting films grown on LaAlO3substrates rose to 96 K.

Fe2O3 - TiO2 THIN FILMS PREPARED BY SOL-GEL METHOD

2011 ◽  
Vol 10 (2) ◽  
pp. 187-192 ◽  
Author(s):  
Ramona-Crina Suciu ◽  
Marcela Corina Rosu ◽  
Teofil Danut Silipas ◽  
Emil Indrea ◽  
Violeta Popescu ◽  
...  
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Tio2 Thin Films ◽  
Gel Method ◽  
Sol Gel Method
Sign in / Sign up

Export Citation Format

Share Document